AUIRFS8409-7P N-Channel 40V 240A MOSFET Equivalent & Substitute Parts

Part Overview

The AUIRFS8409-7P is an N-Channel MOSFET manufactured by Infineon Technologies, part of the HEXFET® series. This device is rated for 40V drain-to-source voltage with 240A continuous drain current and 375W maximum power dissipation in a Surface Mount D2PAK (7-Lead) package. The part is currently classified as Obsolete, making identification of equivalent and substitute components essential for design continuity and procurement planning. Substitute parts must maintain electrical performance within the specified operating parameters while accommodating available packaging and product status options.

Key Parameters

Parameter	Value	Unit
Drain to Source Voltage (Vdss)	40	V
Continuous Drain Current (Id) @ 25°C	240	A (Tc)
On-State Resistance (Rds On Max) @ 100A, 10V	0.75	mOhm
Gate Threshold Voltage (Vgs(th) Max) @ 250µA	3.9	V
Gate Charge (Qg Max) @ 10V	460	nC
Maximum Gate Voltage (Vgs Max)	±20	V
Input Capacitance (Ciss Max) @ 25V	13975	pF
Power Dissipation (Max)	375	W (Tc)
Operating Temperature Range	-55 to 175	°C (TJ)
Package Type	D2PAK (7-Lead)	Surface Mount
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the AUIRFS8409-7P is determined by electrical equivalence across the following critical parameters:

Electrical Matching Criteria:

Drain-to-Source Voltage (Vdss): 40V minimum
Continuous Drain Current (Id): 240A or greater at 25°C
On-State Resistance (Rds On): 0.75mOhm or lower at specified conditions
Gate Threshold Voltage (Vgs(th)): 3.9V or lower
Gate Charge (Qg): 460nC or lower
Maximum Gate Voltage (Vgs): ±20V or greater
Operating Temperature Range: -55°C to 175°C or greater
Compliance: ROHS3 Compliant, MSL 1

Package Compatibility:

Primary package: D2PAK (7-Lead) Surface Mount
Alternative packages: H2PAK-6 (with electrical parameter verification)

Product Status Consideration:

AUIRFS8409-7P is Obsolete; Active alternatives are preferred for new designs and ongoing procurement

Identified substitute parts meet these criteria with variations in packaging format and current rating specifications.

Parameter Comparison

Parameter	AUIRFS8409-7P (Main)	AUIRFS8409-7TRL (Substitute)	STH320N4F6-6 (Substitute)
Manufacturer	Infineon Technologies	Infineon Technologies	STMicroelectronics
Product Status	Obsolete	Active	Active
Vdss (V)	40	40	40
Id @ 25°C (A Tc)	240	240	200
Rds On Max @ 100A, 10V (mOhm)	0.75	0.75	1.3 @ 80A, 10V
Vgs(th) Max @ 250µA (V)	3.9	3.9	4.0
Qg Max @ 10V (nC)	460	460	240
Vgs Max (V)	±20	±20	±20
Ciss Max (pF)	13975 @ 25V	13975 @ 25V	13800 @ 15V
Power Dissipation Max (W Tc)	375	375	300
Operating Temperature (°C TJ)	-55 to 175	-55 to 175	-55 to 175
Package	D2PAK (7-Lead)	D2PAK (7-Lead)	H2PAK-6
Packaging Format	Tube	Cut Tape & Digi-Reel®	Cut Tape & Digi-Reel®
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Automotive Grade	—	—	AEC-Q101

Engineering Selection Recommendations

AUIRFS8409-7TRL (Infineon Technologies)

This substitute is the direct equivalent to the AUIRFS8409-7P. It maintains identical electrical specifications including 40V Vdss, 240A continuous drain current, 0.75mOhm Rds On, and 375W power dissipation. The device is packaged in the same D2PAK (7-Lead) configuration. The primary distinction is product status: AUIRFS8409-7TRL is Active, ensuring ongoing availability and supply chain continuity. Packaging is supplied in Cut Tape and Digi-Reel® formats rather than Tube. This part is recommended as the primary replacement for obsolete AUIRFS8409-7P applications requiring identical electrical and thermal performance.

STH320N4F6-6 (STMicroelectronics)

This substitute provides functional equivalence with trade-offs in current rating and power dissipation. The STH320N4F6-6 is rated for 200A continuous drain current (versus 240A) and 300W power dissipation (versus 375W). On-state resistance is 1.3mOhm at 80A, 10V, which is higher than the 0.75mOhm specification of the main part. Gate charge is lower at 240nC, providing faster switching characteristics. The device maintains 40V Vdss, ±20V gate voltage rating, and -55°C to 175°C operating range. Packaging is H2PAK-6 Surface Mount, which differs from the D2PAK (7-Lead) of the main part. This part includes AEC-Q101 automotive qualification. Selection of STH320N4F6-6 is appropriate for applications where the reduced current and power ratings are acceptable and where automotive-grade qualification is required. PCB layout modifications are necessary due to package change.

Both substitute parts are ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity, matching the compliance profile of the main part.

Frequently Asked Questions (FAQ)

Q: Can AUIRFS8409-7TRL be used as a direct replacement for AUIRFS8409-7P?

A: Yes. AUIRFS8409-7TRL is electrically and mechanically identical to AUIRFS8409-7P. Both devices feature 40V Vdss, 240A continuous drain current, 0.75mOhm Rds On, and D2PAK (7-Lead) packaging. The primary difference is product status: AUIRFS8409-7TRL is Active, ensuring supply availability. No circuit modifications are required.

Q: What are the limitations of STH320N4F6-6 as a substitute?

A: STH320N4F6-6 has reduced current and power ratings. It is rated for 200A continuous drain current (versus 240A) and 300W power dissipation (versus 375W). On-state resistance is 1.3mOhm at 80A, 10V, compared to 0.75mOhm for the main part. The package is H2PAK-6 instead of D2PAK (7-Lead), requiring PCB layout changes. This substitute is suitable only for applications where the lower current and power specifications are acceptable.

Q: Are there package compatibility issues between D2PAK (7-Lead) and H2PAK-6?

A: Yes. D2PAK (7-Lead) and H2PAK-6 are different package formats with different pin configurations and footprints. PCB redesign is required to accommodate H2PAK-6. Direct socket substitution is not possible. Verify pin assignments and thermal pad connectivity before layout changes.

Q: Do all substitute parts meet RoHS and MSL requirements?

A: Yes. AUIRFS8409-7TRL and STH320N4F6-6 are both ROHS3 Compliant with MSL 1 (Unlimited), matching the compliance profile of AUIRFS8409-7P.

Q: Is STH320N4F6-6 suitable for automotive applications?

A: STH320N4F6-6 carries AEC-Q101 automotive qualification, making it suitable for automotive-grade designs. AUIRFS8409-7P and AUIRFS8409-7TRL do not carry automotive qualification. If automotive compliance is required, STH320N4F6-6 is the appropriate choice, provided current and power ratings are acceptable.

Q: What is the difference in gate charge between the main part and substitutes?

A: AUIRFS8409-7P and AUIRFS8409-7TRL both specify 460nC gate charge at 10V. STH320N4F6-6 specifies 240nC at 10V, which is lower. Lower gate charge results in faster switching transitions and reduced gate drive power requirements. This may improve efficiency in high-frequency switching applications.

Q: Can AUIRFS8409-7TRL be used in existing designs without modification?

A: Yes. AUIRFS8409-7TRL is a direct replacement for AUIRFS8409-7P with identical electrical specifications and D2PAK (7-Lead) packaging. No circuit or PCB modifications are required. The only change is packaging format: AUIRFS8409-7TRL is supplied in Cut Tape and Digi-Reel® instead of Tube.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message